This is a ringless implementation of millisecond precision timer and millisecond async_sleep function.
I've added the functionality to the current async mod but this can me moved to a dedicated module.

For now only the async_ms_sleep is implemented but async_ms_route is just a few lines.

Anyway how should I proceed with cleanup so this can be accepted ?

With millisecond precision sleep one can easily implement a leaky bucket request shaper that delays incoming requests to achieve perfect rate limits per customer/sip-trunk/whatever without dropping requests. No more spikes and no more 503s.

I've implemented external HTTP microservice that returns millisecond delays per dialog initiating request and tested it with SIPP with 3 flows/streams each with 250 CAPS. No leaks nor other issues in 24hrs of testing.

You can view, comment on, or merge this pull request online at:

  https://github.com/kamailio/kamailio/pull/2008

Commit Summary

• ms resolution sleep
• fix leak
• add functions
• register additional timer
• don't forget the tail
• timeradd expects normalized parameteres
• Don not eat the chain links

File Changes

• M src/modules/async/async_mod.c (83)
• M src/modules/async/async_sleep.c (210)
• M src/modules/async/async_sleep.h (8)

Patch Links:

• https://github.com/kamailio/kamailio/pull/2008.patch
• https://github.com/kamailio/kamailio/pull/2008.diff

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